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HCQ study #108 of 320   Meta Analysis
8/3 Late treatment study
Yu et al., Science China Life Sciences, 2020 Aug 3, doi:10.1007/s11427-020-1782-1 (Letter)
Beneficial effects exerted by hydroxychloroquine in treating COVID-19 patients via protecting multiple organs
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Retrospective 2,882 patients in China, median age 62, 278 receiving HCQ, median 10 days post hospitalization, showing that HCQ treatment can reduce systemic inflammation and inhibit the cytokine storm, thus protecting multiple organs from inflammatory injuries, such as detoxification in the liver and attenuation of cardiac injury. IL-6 levels significantly reduced after HCQ treatment, p<0.05, and elevated after HCQ withdrawal. The significantly lower dose used here is potentially related to the different observations from the RECOVERY trial results. Authors suggest that treatment should be started as soon as possible.
The 550 patients that were critically ill at baseline are reported in a separate paper. For the non-critically-ill patients at baseline, the proportion of patients that became critically ill was significantly lower for those treated with HCQ.
For the subset of patients that started HCQ treatment early only 1.4% died versus 3.9% for HCQ started late and 9.1% for control patients.

Yu et al., 8/3/2020, retrospective, China, Asia, preprint, median age 62.0, 6 authors.
risk of progression to critical, 82.5% lower, RR 0.17, p = 0.05, treatment 1 of 231 (0.4%), control 32 of 1291 (2.5%), baseline critical cohort reported separately in Yu et al..
risk of death, 85.0% lower, RR 0.15, p = 0.02, treatment 1 of 73 (1.4%), control 238 of 2604 (9.1%), HCQ treatment started early vs. non-HCQ.

Effect extraction follows pre-specified rules prioritizing more serious outcomes. For an individual study the most serious outcome may have a smaller number of events and lower statistical signficance, however this provides the strongest evidence for the most serious outcomes when combining the results of many trials.
All 320 studies   Meta Analysis
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